Add bulk import feature and supported sites display

- Two-tab UI: single import (existing) and bulk import
- Bulk mode: paste multiple URLs, choose review-each or auto-import
- Review mode: edit each recipe before importing, option to switch
  to auto mid-way
- Auto mode: scrape and import all without manual review
- Tag option for auto mode: import all tags or none
- Progress table with per-recipe status tracking
- Import targets: Mealie, Tandoor, or both
- Supported sites shown on both tabs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/main.py

@@ -6,7 +6,7 @@ import traceback
 from flask import Flask, render_template, request, redirect, url_for, flash, jsonify
 
 from app import config
-from app.scraper import scrape
+from app.scraper import scrape, supported_sites
 from app.mealie import MealieClient
 from app.tandoor import TandoorClient
 
@@ -93,7 +93,8 @@ def import_page():
         flash("Először állíts be legalább egy szolgáltatást (Mealie vagy Tandoor).", "warning")
         return redirect(url_for("settings"))
     return render_template("import.html", cfg=cfg, version=VERSION,
-                           has_mealie=has_mealie, has_tandoor=has_tandoor)
+                           has_mealie=has_mealie, has_tandoor=has_tandoor,
+                           supported_sites=supported_sites())
 
 
 @app.route("/scrape", methods=["POST"])